# Share of days with good air quality (US EPA AQI) in Clackamas County

Share of days with good air quality (US EPA AQI) in Clackamas County was 87.6% in 2025. Source: U.S. Environmental Protection Agency.

- Indicator id: `aqi_good_days_share`
- Place id: `us-county-41005`
- Unit: %
- Definition: Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.
- Note: United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual)
- Retrieved: 2026-10-12
- License: Public domain (US government work, 17 U.S.C. 105); citation requested
- Citation: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/good-air-quality-days-share/clackamas-county-oregon
- API: https://invokely.ai/api/v1/series?indicator=aqi_good_days_share&place=us-county-41005

| Period | % |
|---|---:|
| 2025 | 87.6 |
| 2024 | 89 |
| 2023 | 83.3 |
| 2022 | 78.6 |
| 2021 | 90.4 |
| 2020 | 87.5 |
| 2019 | 95.1 |
| 2018 | 82.1 |
| 2017 | 82.4 |
| 2016 | 94 |
| 2015 | 85.6 |
| 2014 | 86.3 |
| 2013 | 92.6 |
| 2012 | 86.2 |
| 2011 | 94.1 |
| 2010 | 94.8 |
| 2009 | 84.4 |
| 2008 | 93.2 |
| 2007 | 94.1 |
| 2006 | 82.7 |
| 2005 | 86.6 |
| 2004 | 72.1 |
| 2003 | 87.9 |
| 2002 | 93.8 |
| 2001 | 93.6 |
| 2000 | 93.4 |
| 1999 | 89.8 |
| 1998 | 87.2 |
| 1997 | 94.7 |
| 1996 | 86.1 |
| 1995 | 88.8 |
| 1994 | 84.6 |
| 1993 | 95.2 |
| 1992 | 79 |
| 1991 | 70.8 |
| 1990 | 70.9 |
| 1989 | 92.7 |
| 1988 | 84.5 |
| 1987 | 78.2 |
| 1986 | 90.1 |
| 1985 | 90.1 |
| 1984 | 95.9 |
| 1983 | 96.1 |
| 1982 | 93.2 |
| 1981 | 91.2 |
| 1980 | 95.4 |